Adjustable head for a sprinkler



FIG. 1 is a perspective view of an adjustable head for a sprinkler showing my new design;

FIG. 2 is a front plan view of thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a left side plan view thereof;

FIG. 5 is a right side plan view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a rear plan view thereof. 

The ornamental design for an adjustable head for a sprinkler, as shown and described. 